Messier 10 (Ophiuchus)

Object: Constellation: Coordinates: Size: Brightness:
Messier 10
(NGC 6254)
Oph 16h57m / -0406' 20' 6.6mag

The globular cluster Messier 10 (NGC 6254) in the constellation Ophiuchus on May 21 / 22, 2020. Messier 10 is the second brightest globular cluster in Ophiuchus and is estimated to be 14,300 light-years away from Earth. Its spatial diameter is approximately 83 light-years. Messier 10 was discovered by French astronomer Charles Messier in 1764 (source: Wikipedia).

Twenty-three 3 minute exposures at ISO 800 were added for this shot with the DeepSkyStacker software (resulting in a 1 hour 15 minute exposure) and the final image processing was done in Photoshop.
Equipment: Canon EOS 450D Baader modified camera, TeleVue Paracorr Type II coma corrector, 16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Lacerta off axis system (field of view comparison: image of the moon with the same equipment).

Search chart for Messier 10. Map © 2020 "The Mag-7 Star Atlas Project", Map is slightly modified. The map can be downloaded here .